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NET INCOME PER SHARE - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 68.0	$ 318.3	$ 381.5	$ 624.8
Denominator:
Weighted average shares outstanding used in basic calculation	116,800	115,400	116,600	115,200
Add: dilutive effect of potential common shares	2,900	3,900	3,100	4,200
Weighted average shares outstanding used in diluted calculation	119,700	119,300	119,700	119,400
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 0.58	$ 2.76	$ 3.27	$ 5.42
Diluted (in dollars per share)	$ 0.57	$ 2.67	$ 3.19	$ 5.23

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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